Sharpener for feed cutters



Dec. 3, 1929. c. A. HOLM ET Al. 8 0

SHARPENER FOR FEED CUTTERS Filed Sept. 2, 1926 2 Sheets-Sheet Dec. 3,1929. c. A. HOLM ET AL SHARPENER FOR FEED CUTTERS Filed Sept. 2. 1926 2Sheets-Sheet 2 Patented Dec. 3, 1929 CHARLES A. HOLM AND MARTIN HOL M,OF TIGERTON, WISCONSIN SHARPENER FOR FEED CUTTER/S Application filedSeptember 2, 1926. Serial No. 133,230.

This invention relates to sharpener for feed cutters.

In general, this invention is an improvement over that disclosed inPatent #1339,-

511, ofMay 11, 1920, for sharpener for feed cutters.

Objects of-thisinvention are to provide a novel form of sharpener forfeed cutters, which is so constructed that the sharpener carries anabrad'ing block in a manner to permit accurate adjustment to the exactrequirements of'the machine, and which so holds the block that there isthe minimum chance of breaking or straining the block.

Further objects areto provide a sharpener which may be permanently leftupon the machine, and which will operate automatically to maintain theexact degree of sharpness required for the cutter blades.

Further objects are to provide a novel form of holder for the sharpenerstone in which means are provided for positively limiting the forwardmotion of the stone, and in which yielding means are provided whosepressure may be adjusted for controlling the outward motion. ofthestone.

Further objects are to provide a sharpener which is so constructed thatthe sharpener can not tilt or otherwise change its angular setting withrelation to the cutter knives, buti'nstead in which thestone ispermitted to move in a horizontal plane towards or from the knives, thusmaintaining with accuracy the desired angle.

Embodiments of the invention are shown in the accompanyingdrawings inwhich:

Figure 1 is asectional view through a feed cutter and through thesharpener;

Figure 2 is a plan view partly broken away of the sharpener.

Figure 3 is a sectional view on the line 3-3 of Figure 2.

Figure 4i is a view corresponding to Fig- 4f pre 1 showing a modifiedform of the invenion.

Figure 5 is a fragmentary plan view of the structure shown in Figure 4,with parts broken away.

Figure 6 is an edge view of the structure 5 shown in Figure 5.

Referring to the drawings, it will be. seen that the side frames 1 carrybearings-for the. driving shaft 2 of the cutter 3. This cutter, isprovided in the customary mannerwith. cutting blades 4.

The sharpener comprises a pair o-ii-v brackets 5 mounted directly uponthe side bars 1 and provided with upstanding front. and rear lugs 6.These brackets cooperate with upper plates 7. Bolts 8 extendthrough. theupper plates and through the brackets and into the flanges of the sideframes 1". These bolts are provided with compression springs 9 whichurge the top plates downwardly.

The holder for the sharpening stone con,- sists of a bottom member 10and a top member 11 between which the stone 12 is held. 'ihie holder hasits upper and lower me1nhers flanged to increase their strength. Thebottom member 10 is provided with anupstanding shoulder or web 13against which the rear face of the sharpening stone 12: abuts. The endsof the holders 10 and 11 are mounted between the brackets 5 and theplates 7, and are thus clamped by means of the compression springs 9. Ifdesired, the holders may be extended rearwardly a slight distance, asshown in Figure 2, and additional bolts 14; may be passed through suchextended portions.

The flange or shoulder 13 of the member 10 is; provided with a socketateach end within which rubber blocks 15 are positioned, as most clearlyshown in Figure 2. These rubber blocks are compressed bymeans of thefeet 16 of socket members, such socket members being carried by means ofthe balls 17 formed on the ends of the adjusting screws or bolts 18. Theforward motion of the holder is limited by means of the front screws 19which pass through, the forward flanges of the brackets 5 and align withthe rear screws 18.

Thus the forward motion of the sharpener is positively limited by meansof the screws 1.9,and these screws-may, therefore, be ad-. justed tosecure the exact amount oiimotion forwardly which is desired. The rearscrews 18 are adjusted to produce the requisite yielding pressurebetween the stone and the passing blades.

It is to be noted particularly that the stone securely seats upon thebottom member of the holder and backs against the flange 13, so thatthere is no possibility of turning or twisting of. the stone. Further,it is reenforced bythis rigid bottom member throughout its length. Thetop member of the holder is yieldingly pressed into clamping engagementwith the stone.

Referring to the form of the invention illustrated in Figures 4 to 6, itwill be seen that the same type of rotary knives are employed as thatpreviously described, and these knives are carried by a spider mountedon a drivingshaft 2 journaled in bearings carried by said framemembers 1. The side frame members 1 carry at their ends a two- .partcasing. This casing consists of a main member 20 which is provided withapertured lugs 21 through which elongated bolts 22 pass and secure thedevice to the side frame members 1. However, it is to be noted that the.bolts carry compression springs 23 which stone 24 by means of the bolts26. It is to be noted that the bolts do not rigidly hold members inclamping position, but such bolts carry compression springs 27 whichyieldingly clamp the stone in position.

'In order to provide for the requisite adjustment of the stone, the mainportion 20 of the casing is provided with threaded bosses '28'throu'ghwhich adjusting screws 29 pass.

These adjusting screws bear at their forward ends against the stone 24and due to their spacing," hold the stoneagainst rocking motionlor otherdisplacement.

It'will be'seen that there is no chance of "cracking the stone when itis clamped in posi tion as the stone is yieldingly clamped. In.

addition to this the exact adjustment may be secured by manipulating thescrews 29. In addition to this, the entire casing is permitted to yieldthrough the medium of the springs 23, and although the forward motion ofthe's'tone is limited, nevertheless it may move rearwardly as requiredwhen contacting with the knives. Thus a predetermined pressure may beexerted by adjusting the tension of the springs 23 and in addition tothis the exact adjustment of the stone may be easily secured, asdescribed above.

Thus it will be seen that the stone cannot shift its relative angle withrelation to he blades, but may merely move backwardly a slight distanceto provide the requisite yield as the blades pass the stone.

Although the invention has been described in considerable detail, suchdescription is intended as illustrative rather than limiting, as theinvention may be variously embodied and as the scope of such inventionis to be determined as claimed.

VVe claim:

1. In a device of the class described, spaced frame members, a bracketupon each frame member, spaced lugs carried by each bracket andincluding a front and rear lug, a holder supported upon said brackets,means yieldably retaining the ends of the holder in position on thebrackets, adjustable means for limiting lateral movement of the holderin one direction, said holder comprising upper and lower plates and asharpener stone arranged between said plates, with one of itslongitudinal edges extending beyond one of the edges of said plates, anupstanding flange on the bottom plate forming a stop for the stone, saidflange having a socket at each end thereof, rubber blocks arrangedwithin the sockets and adjusting screws carried by the rear lugs of thebrackets and having ball end portions for engaging the rubber blocks toprovide for yielding movement of the stone.

2. A sharpener for cutters provided with side frame bars and rotarycutter knives, said sharpener comprising a pair of U-shaped bracketsmounted upon said side frame bars, clamping plates yieldingly pressedtowards said brackets, a pair of holder members mounted between saidbrackets and said plates, a stone carried between said holder members,one of said holder members having an upstanding rear shoulder portionforming a stop for said stone, adjusting screws passing through thefront arms of said brackets and limiting the forward motion of theholder, adjusting screws passing through the rear arm of said bracketsand having adjustable bearing feet at their front ends, and yieldingpads interposed between such feet and said holder.

In testimony that we claim the foregoing we have hereunto set our handsat Tigerton, in the county of Shawano and State of VVisconsin.

CHARLES A. I-IOLM. MARTIN HOLM.

